Windows 10: Win10 Pro & Win11 Pro - How to set up unattended remote control between computers

Hello,I need to set up the ability to remotely access and control multiple computers in my apartment. Neither the computers nor the network are business related, they are my own personal computers in my apartment. I have decided to relocate one of my laptops to my bedroom and have two other computers in my living room. The equipment and network are as follows:2 Laptops and 1 desktopOne laptop is a 13 yr old but the HW & OS has been upgraded over the years to the max and this machine is on Win10 Pro the other laptop is approximately 3 years old and is on Win 11 pro and the desktop is a

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Win10 Pro to Win11 Upgrade

I have a new computer with win11 Home installed, can I use my win10 Pro license to change to Pro on the new computer?

 

Upgrade Win11 Home to Pro with Win10 Pro license

I purchased a PC with Win11 Home on it.

I have on my Microsoft account a Win10 Pro license from my old PC that is not being used.

Can I use that Win10 Pro license to upgrade my new Win11 Home to Pro?

 

Access Win10 Pro Computers from a Win11 Computer per Remote Desktop

I have three Computers at Home. 2 x Win 10 Pro; 1 x Win 10 Home. All my computers don't fullfill the CPU requirements of Win 11. Background of the question is: I would like to stay with my 2x Win 10 Pro computers two years more and upgrade then (Cost).

If I upgrade my Win 10 Home Computer to Win11 - can I access my two Win 10 Pro computers via remote desktop or are there any compatibility issues?